/**
 * @author:李雄
 * @ClassName:StringTest
 * @Description:
 * @createTime:2022-08-08 14:36
 */
public class StringTest {
    public static void main(String[] args) {
        String str= new String();
        StringBuilder sb = new StringBuilder();
        StringBuffer sb2 = new StringBuffer();
        System.out.println(str.length());
        System.out.println(sb.length());
        System.out.println(sb2.length());
    }
}
